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Finding the Fourth Proportional to 994.61, 1,371.98 and 679.73

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Solution

The fourth proportional to 994.61, 1,371.98 and 679.73 is: 937.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.61 : 1,371.98 = 679.73 : x
  2. Step 2: Convert to fraction form
    994.61/1,371.98 = 679.73/x
  3. Step 3: Cross multiply
    994.61x = 1,371.98 × 679.73
  4. Step 4: Simplify right side
    994.61x = 932,570.80
  5. Step 5: Solve for x
    x = 932,570.80/994.61
  6. Step 6: Final answer
    x = 937.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.